This example shows a reusable scatter plot of daily business metrics from a CSV file, plotting signups on the x-axis and revenue on the y-axis with a point for each date. The visualization is built with D3 v7 using the `d3.csv` loader and `d3.scaleLinear` for both axes, while `d3.axisBottom` and `d3.axisLeft` render the tick marks. Each circle is appended via `selection.selectAll().data().join()` with opacity and a fixed color, and the chart includes a title and axis labels. The code defines a reusable `scatterPlot` function to allow flexible customization of data columns and styling.